Good point on the lack of firewood above the three line! Signal fires are excellent, make one if you can.

If you're high up - above the three line - in the winter you will make an excellent contrast to the white background. Assuming good visibility, anything above the three line that isn't snow will be seen. But that doesn't help much if they think you're a rock. Your challenge becomes to be as different from a rock as possible.


Colors not found in nature is good. Movement is good. Combine them is even better. Flapping a big orange rescue bag around is probably top notch.


Remove snow from the equation and being spotted becomes much harder. Same principle of movement, contrast and colors, but the background is much less uniform and much more colorful, making everything harder.


Of course, a signal mirror is excellent on a sunny day, everywhere and anywhere.